Photo by: Paul J. Richards
U.S. Secretary of State John Kerry (center) introduces South Korean President Park Geun-hye (left) to his senior staff members as they meet at the presidential Blue House in Seoul on April 12, 2013. (Associated Press)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.